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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3bf2567f747be5ccaea37d4733eaf6ce80e7d43527d629fd640aa7e2ee4f66' 
  AND token = '1c5toGqxUrgYdKtiunwaxCKtT5KSNJBO8zAGGt/8l3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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