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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83c8627223cd27cfd228e018a65241a0635473cba8002009b745af84ad209c7' 
  AND token = 'ZQKvgmfwtf7Xc0ZZHZuZal1A4SWp0mo9yKSF3r7BGDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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