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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b06d994cdb0cc64ae6c34f1b1be64d70777d62740e4c6d1ac614ccb493d4d52' 
  AND token = '/5G/zcKYwDLRECJUX/bUoDEBeefIvL0mMl6KtXScoT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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