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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adaa4f81e4243c1235f28a2a5ccaf6991b830f712681048b8f4e436b24dad2c' 
  AND token = '88U/z7MtIvPmYhgQ0mlSF27pfpcxvIxMY0olKuaEAlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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