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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967ae68d3472d79623fe3e43d83d7044575c3392adab7c0f2fa6ea739535efc6' 
  AND token = 'IcNbfM8Xktfc6xxOukE5RvJZy9u8CyvNei9T0aqXM8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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