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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79d0a9b9bee13740aa5603b35ed2ba72895bf7b9b47cfbe6808ffcb9830c4b7' 
  AND token = 'GRB8KclaJXpRTcgoaP/PrRFKqrkRqcapJXRB+Yhn8L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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