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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9364415644049345854a9c3ae4c14d926d71f1fcc13a517cf1b9f3c0e1434be' 
  AND token = 'eEVp91g+diEtTydu3PfBB8XgdZSttfGYpzbbULWNkJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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