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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0970e2135f26a6b1443305d7a896fcfee3468a521d19c5f2a239a9cfd3578ac8' 
  AND token = 'etJ7MX1bh2cGeOrJyTjzfOvq4k4eYNf6G+DNJLy4bMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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