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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fec8a51c9c44bf0ef8d61362d0945f98cb4c5ce447c556e69db0468bfa5b821' 
  AND token = 'dlBerkv46BF2tYdlprmImw64Nn2ju29Ls4jNc4p954M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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