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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd037f105d05b8e14de9e2f5a8036c198e44589cc3ea6e75f05a95433c511ee' 
  AND token = 'woYwfgOezV06gv28tD+k7613QA//0T2rNGyHYn5HwJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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