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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16e5dc66e681c75b63ca01e96179b411f80060f797b8df9a5c9c61e52fc141b' 
  AND token = 'YC8L3HKC3dfrE5KT5whk6ZaY/W4/7u8oYfsT7JjM67c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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