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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa094d6984a14dad79e4d7950baba5c816390e56131f072ed5f2f0abd68a390' 
  AND token = 'fcfFtbxQUNDMMTxb6L5g4+xLWtYBktx5pJ7LKJqQCgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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