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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcedfb7748ea6f68b4344a95e2a6bbef9e1cae7aba4d9fba74c613aa38eb3c5c' 
  AND token = 'PIWRqbG310ZgUMxRhQQEcBfQK1RiNwuQuNtTa1vMArk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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