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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4703cdfc05f0367236c172f714773369063cb7408369bb3871819bff81aefc4' 
  AND token = '/Aj70RZD3d73+HgAOpyt7H3gbC7T6s1qY/KV6mEreLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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