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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f70f0a98e5797d274d890d2ef5c1a66e13a674914e75e905af964a5302bcf44' 
  AND token = 'FOdIOeMM0qPycPwJuTDEfBuuZ02Q91I4TN1qiNaPEig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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