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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272d83e9920c506a296b0795bf183c6b31c7494713ba5ca7363bb734350c774e' 
  AND token = '/kITwf9x3t/6J44xB9kDB4spSZVJ9tvqEP1mPOXM3Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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