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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba595a8c51b88b3ad3c62965574656c272e3da0198f1f8a6aeac73074effa0d0' 
  AND token = 'teEm8sullLM7SPt62ipPrHnKA10lRlCRVq0IhQevu1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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