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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767aa4f4922769740ab91e4ea3e1271d2455b375f7619921ac9e5933c5746f17' 
  AND token = 'ND/aELZyEQ6nkZRBS//uX55EbLJcHv8UbvDadOq7D7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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