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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49363d33d034ab3c8e633bb1ff9a30ddc8a6293109dc9648bb40167ef6bcc074' 
  AND token = 'WaGVdHA6j93rtdRtppdaaODh25iYhZUCf81E2IcOwSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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