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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3052d3b8e36b030dbf74196698cce8c1452c375d710eddd0eba8afb0619c8449' 
  AND token = 'ByAm7GxtLd8d6ZcfCTVAo6QbRZ2TIQTv1+LnOXg9k3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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