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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce1caf14f9c9f5cbdae0c3ce8a62b6277314ee965cd20b319783ec4d65c248e' 
  AND token = 'MTGSWZc0oDycIpXZ6Gu0ZWN2yPCk5Uv7YtpQEC94fv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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