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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91ecf1094944350bb5d89c6d67b44771802098204245ba236d085c6f709dd65' 
  AND token = 'O6xbjjwuupvh+EINmv64+eAq9DerHZBSyX436O8vNYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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