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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db9a94b3d5a288177e437cb23bec721557dbac812b6d9b42551338f7d2354f6' 
  AND token = 'qqhp+37N9uXAfmEDyAQdVSE6z3wS78s/qOElllX6mHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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