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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c31dc5c1317e25cc4ca7b0d723e74508bd0c81b24eeb5545bcbf813af26c85' 
  AND token = 'u3nxBjpRhupR41oEF/1vlIC2iYt9ZRm6SDjWwpLLhys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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