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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066e4d5c1bb3aa0ec0b208957ead06392a23ee4b5de2af1491dbe8dbbc7efb1c' 
  AND token = 'cG7mXO/xI8wPbAHGB6JhnSU5TD9JkZglLtHt9NnDHjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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