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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55f1cdb7668fcc8ac48c74c41c8de65479c2324d1280772c7c2a6d3c84a2083' 
  AND token = 'MJMTrjUGM9JwrdngHQbh8I7wNBdryKWkjEQ714qi6C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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