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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b399954cbbe9f9a64457c77f3cf5fd10603cb73e18e5459cf0934c2ce32e97' 
  AND token = 'UaxlHe/Ny6vb/GGBSsu89UC/OQ1QPmReC9kAfOJ8QMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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