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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db65c56c7b44e916ec43a0077fc4392c9f47e1068d9d9a79f21c44e528a5bb5c' 
  AND token = '6tNzbxZdapKI1WjZwFsUvtWJRO5F7UqEuIbm8Q1jpMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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