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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31502d0b8b5fc788e7262a8f2920534beeefe340c7b488516f90741c9a526939' 
  AND token = '1XU1jlWG5KcOuVk8D1XS2PAu68zBCX/BCaXtwieK/QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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