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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f5345de3b0b23d439d8d888f40ca5476ef1cf865e1e943effdc6ed7d4543e9' 
  AND token = 'Rp6P9L42h92T8rnNXcLrhSyAF8hCUpXGxWgOXzkKYw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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