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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad7852781bca735b41faa887fb9ca7fa4becddb55b03e7d2ca9ebf23ce8dbf1' 
  AND token = 'FekQmb8jOkaRouHdYrerfqvZEOQSfbRf63919XDzT5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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