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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8ed699cf969b533df0e28feebc39f88e37482beecc515c9a9789583b6fc8eb' 
  AND token = 'QVyM/S7GP4kbTvnG1Y1n0IpfX/eCGvd1e3L7BBivYjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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