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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a7b5f70a03c50a23758f1cea044a37507e3ed3614b7ce755d9cc6fc2d90fdc' 
  AND token = 'uLto9Zy3/zcd7IdB6CS7jdNaZa1aAH4LAP+VK+1kleQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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