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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810bc4349e77efc1c43a5ea5660147e72b6d0bfc6f1192be721a34244baa12cb' 
  AND token = '1ZkG2xTTyl1Lq7IxwoTjOL7l8uYxYKw/KgInOWlZ1Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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