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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7652b4ca7a94a3a5674d8422e0efd60b48003cfdc4e5123a39041de75299563' 
  AND token = 'h1gPmSBVtVlsatANHui0D5iLUUJvIsNHcg2ctTBAsvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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