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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b505a75d5c4812fc41a3382c5e25f63332ffe0009569c6f20a92669e3c8dafed' 
  AND token = 'g5CJJHH1XjkCOJFuieWUZ+NZObkB13aMt/3hB3ncetw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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