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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab453b53020dba23e4a349d56bd9c6336dcdb057fe3fa852693510f39580e376' 
  AND token = '0/N4Q6ql9ipn+0Jf49nWvokb1cGP1qlp75M72gR6sGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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