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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ec1d509702f7982dbf1255a90004b767a1b40e29eb0f0ae40c542cad3fe669' 
  AND token = 'jJzGl0L9tQP979WpbNk8z3CFVUHvuixmLfmw5t08KXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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