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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c421ff9cc80df1343cf1a38ec34f09dae310963a8b12fbd0a3018a752546a2d' 
  AND token = 'L8uw+T/qr5ObnJcq+Az+0z9UPGPfMX3tIZvkmj0e/xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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