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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7285e61e039362afffe8f093c40f528304242973123b0feff194b3785591ce' 
  AND token = '4Quydxub0xxHGRhhN4o5qqy1f7aL5rVBmYkj7o+5Za4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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