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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb54f4741ee9cdf79744dfc2eb0e4bbb11d684728b18607a18e8303502b8d95' 
  AND token = 't0+p0VrcLT0Hwz1u0qlkfRNx2NXQGJekPYy48Xv3x44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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