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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb1d0e75b45e4bc6f721981b6a807847c47eb2e02b464a49b0866d7b6753f34' 
  AND token = '3bYLukxj3GE0XJqRVXzViVSuE8PL9ubqm9Dor0WsbCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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