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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55d61cab4726864c7e5eb6da484b2bc78d69cdd21032f616bbbedb2acf985c7' 
  AND token = 'FdokB103bUblech3gp1y29ohHLAdDMBcnLMfZNf8wMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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