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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e8970f415fece05cd9dd16ab4ef9121efb85ed6e4c8b20dbe3b1965a688ceb' 
  AND token = 'gNLSrGXWH83hFShM8iedp9tl+0nTDvL1ATq3uoXc/Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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