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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6e51dae0e0dd4d77ba9ab6491085a5251b6d91b0976b38fc9529a752ca15d8' 
  AND token = 'MNlADNsJtx6o1dHvkxJIt8ppAPDSLE8cLMNXoAagaRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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