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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336bf5580c01e589a5595dffefd1a96110984484df87f7516c7c6241a3cbe970' 
  AND token = '0uBmfh8oAaOP9ZODuRYBIOxQ8yZJoDOQBKHnig5xEQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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