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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3c5d14a16a450a793616334c23b4f3e6456a6f9d1b082181ea038d72b94e7e' 
  AND token = 'TRhEZa+H1oGn9UHgtv5LleBIFcxYBDqDfTnt2Fy2Ekw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00400

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}