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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa206f792260aed00488fcf5b835f61f4fc7a75abf569f5dd30ac79a3071a1b' 
  AND token = '+90FO5SqlzRYCSKlaQRA1VYR+orKfXijyHD+ucwXbdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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