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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa7517299c8f92b0c990b3612b95c7fcc20d414a71191eb160191db0b0c5370' 
  AND token = '99UkNkXWT0x0H7Q7EfzHIzVTjQe+TXN/MnUlPP3e7kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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