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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc154c84aa82cbec34bb155c34de0448b0fee257d7741bd884ce71b974346d37' 
  AND token = 'HnhpFdbWMkAD0tE0k5G7MEkjko3iZ321u5e5NgTv3iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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