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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cacd80dcbeb28c0f2bf71c719f763c598eb7497f9f0d1ac3e1b0e0e24efe852' 
  AND token = '7CGgBDFfhzYIYfG5/utqgosCX/Wrs0yPh8LPTva/EYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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