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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0dd348686afa1a4f615b1c553e62dc3d82b9cb58e92359ddbc80e0ff0653bb' 
  AND token = 'x5ax1UQBiuRpHocblzu/2zaEROuxhETzxJu2IBBYJBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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