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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f2642759ded2144c4f351869e7818eadbdaa178db86c3e85ac32a0345a2f2d' 
  AND token = 'ezsIto3NlbeKggqOLDjOMkbJP/M775q20gYdFVxKMGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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