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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3796302359163c20a6c0eada2b181012177bf26b53a3ff9e08beaec07953fc8b' 
  AND token = 'YYZm8/xrGOpKUtoha07zKy1I4fx8TA/Y/ypJAqcuuE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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