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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b1d1d140f8772892c09885e65218b979f9980f34d44430fd1261e3a3c905ef' 
  AND token = 'tWEw/p0oj5470Y6wBYNwNAyo0Lc2uis7uioLaf6LDic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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