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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5a48488f96442241a1c1e9d66fe194a1ef407af3efbd587566d70625a210e5' 
  AND token = '2G8H4394hH8sxIt9UEZkkXNszNqLK/3FVLFaJXGS88k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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