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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2b7e5f2034269cf562c8aa5f42049190cbd152d9fa16043827531a7334b04f' 
  AND token = 'fWsDL2gI1hfyxJ2e1kN3ASeiJMYxO07f6zPtHZqLLQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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