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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8973542f1ea0960155607ff21b9368182f9c2b71dcb8503530c8f05d58100dd' 
  AND token = 'JSw2a7zCvSleao9U0mG/zm4nzxyDBtfBVIIVrnGwBwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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