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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a7f0497428c5cfc3c7f30f966ad61c3880ce637ebd22ed2740a142b50fe301' 
  AND token = 'ME26MneAD69beh2SVx2jf5RjY5TiJbUDiPMet/MNL04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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