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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173a803414659861aa91a67c3e8011ac06732b0b079b0c5dc90b750efc4802a0' 
  AND token = 'F/F+Ue3SxXL+5fVVtd67ZZkTrLN9hUaTKe+pDy46/Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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