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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46f76517f8e5f351902fad200dec3c923728bc12323e19839e3fee4f9cf9e83' 
  AND token = 'FFcp7UOf241xNEsHgqBllsToVRqhZ1ioP56AzPhh7AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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