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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7691024d8b279eb17761886492dc56d37c063b9f65312709af272c959c2f20f' 
  AND token = 'vHaqp1Xn6Yna5zcg8hWFBsqAPiom0BBXG7RDbMnthe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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